Probably, mithril... I was going to ask that 2
About that last question. If I were to pick one it would be bacteria, because it can live in a lot of places where humans can not. But, in my opinion you can not compare a domain(Bacteria) to a species(Homo sapiens). Anyway, i guess your answer will do.
Except for the one with s1 and s2 they are all fine

"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

on the worksheet she gave us, it says S1 and S2, i guess the teacher made a mistake.... it probobaly was supposed to be G1 and G2 ..... so in G1 it would still have 40 chromosomes and in G2 it would have 80, right?

And for the Monohybrid cross, Wouldnt that involve two genes, Because arent you crossing one gene with another gene, total of two genes involved